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SMS Tutorials ADCIRC – Symmetric Cyclone Simulation
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SMS 13.0 Tutorial
ADCIRC – Symmetric Cyclone Simulation
Objectives
Overview the ADCIRC functionality used to generate the winds of
a symmetric cyclonic storm (NWS = 8) and the interface to this
option in SMS.
Prerequisites Overview Tutorial
Map Module Tutorial
ADCIRC Tutorial
Requirements ADCIRC Interface
ADCIRC Model
Time 20–30 minutes
v. 13.0
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SMS Tutorials ADCIRC – Symmetric Cyclone Simulation
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1 Introduction
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2 2 Setting Up the ADCIRC Simulation
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2
2.1 Opening the Project
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2 2.2 Review of Model Parameters
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3 2.3 No Wind
Solution...................................................................................................
4
3 Defining the Storm
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4 3.1 Storm Path
.............................................................................................................
4 3.2 Interactive Storm
....................................................................................................
5 3.3 Storm Parameters
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6 3.4 Setting the ADCIRC Parameters for Wind
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7
4 Running ADCIRC with Wind
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7 5 Visualization of the Computed Storm
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8 6
Conclusion.....................................................................................................................
8
1 Introduction
This tutorial discusses and demonstrates the ADCIRC wind field
generation option used
to represent a symmetric cyclonic storm during the ADCIRC
simulation. The ADCIRC
model includes many options for simulating wind in an analysis.
The wind and pressure fields generated by ADCIRC can be exported
during this type of simulation for
inspection in relation to hydraulic currents and water levels
computed during the
simulation.
ADCIRC supports multiple wind formats and includes two separate
wind generation models which can simulate cyclonic storms. Storm
definitions can be downloaded from
historic databases or defined interactively.
2 Setting Up the ADCIRC Simulation
An ADCIRC simulation must exist to apply a cyclonic storm model
in ADCIRC. For this tutorial, a fairly low resolution
representation of the Western North Atlantic (WNAT) is
provided. The grid (fort.14 or *.grd) consists of approximately
53,000 nodes. For
information on how to set up a basic ADCIRC simulation, refer to
the “ADCIRC”
modeling tutorial.
2.1 Opening the Project
A base project has been created in order to save time.
1. Launch SMS, or select File | New to remove any existing data
if SMS is already running.
2. Select File | Open… to bring up the Open dialog.
3. Select “Project Files (*.sms)” from the Files of type
drop-down.
4. Browse to the data files folder for this tutorial and select
“NWS8.sms”.
5. Click Open to import the project and exit the Open
dialog.
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SMS Tutorials ADCIRC – Symmetric Cyclone Simulation
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6. Select “ 53K WNAT” to make it active.
The domain should appear similar to Figure 1.
Figure 1 The NWS8 file displayed in SMS
2.2 Review of Model Parameters
It is always a good idea to be familiar with a simulation before
modifying it. Since this project was provided, take a few minutes
to review the characteristics of the simulation.
1. Select Display | Display Projection... to bring up the
Display Projection dialog.
2. In the Horizontal section, confirm Global projection is
selected and the projection below is set to
“GCS_North_American_1983”.
Most ADCIRC analysis runs will utilize geographic space, but
often the grid is constructed in a rectilinear space and then
converted to the geographic projection.
3. Click OK to exit the Display Projection dialog.
See the “Projections” tutorial for further instruction on
setting projections.
4. Right-click on “ M2 Tide” and select Model Control… to bring
up the ADCIRC Model Control dialog.
Review the selected model parameters:
5. On the General parameters tab, in the Run options section,
note that “None: cold start” is selected from the Hot start file
(initial conditions) drop-down.
6. On the Model formulation tab, in the Nonlinear terms section,
notice Finite amplitude terms has “No wetting/drying” selected and
the Advective terms (NOLICA) and Time derivative terms (NOLICAT)
are turned on.
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If an inundation study were desired, the wetting/drying should
be enabled. For any real simulation the advective and time
derivative terms should be enabled. They may be
disabled to enhance speed when testing the stability of a
mesh.
7. On the Timing tab, in the Interpolation reference date
section, notice that the date is set to “8/15/2010 12:00:00
pm”.
This is the cold start date. It is used as the reference date to
extract extract tidal constituents from a tidal database. The cold
start date also comes into play when using
“NWS = 8 – Symmetric cyclonic storm from path” option from the
drop-down in the
Option – NWS section of the Wind tab. The defined storm must
span the duration of the
simulation. The time step can be so large because the project is
only using linear terms.
8. In the Timing section, notice that Time step (seconds) is
“20.0”.
9. On the Wind tab, in the Option – NWS section, notice that the
Wind File Type is set to “NWS = 0 – No wind”.
10. Click OK to exit the ADCIRC Model Control dialog.
2.3 No Wind Solution
A solution for the simulation as configured is included. The
datasets, which are in the “
M2 Tide” folder under “ 53K WNAT”, consists of water surface
elevations and depth-averaged velocities at hourly intervals for
four days of simulation (day 1 to day 5) as
specified in the Model Control dialog in the Output tab.
If desired, examine the solution datasets to be familiar with
what ADCIRC is computing. It is not necessary to view this solution
to complete this tutorial.
3 Defining the Storm
The cyclonic storm consists of a geometric path stored in
coverage and storm parameters
defined for each point on the path.
3.1 Storm Path
The storm path describes how a storm moves through space during
its existence. This is
the geometric definition of the storm. There are two methods of
defining a storm path: It can be specified interactively, or
imported from a file.
For this tutorial, use a storm defined in a “Best Track” (ATCF)
file. File formats that may be used, and common locations to get
these files, include:
ATCF1
HURDAT2
1 See
http://www.nrlmry.navy.mil/atcf_web/docs/database/new/database.html
http://www.nrlmry.navy.mil/atcf_web/docs/database/new/database.html
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To import the storm for this tutorial, do the following:
1. Click Open to bring up the Open dialog.
2. Select “storm.atcf” and click Open to import the file and
exit the Open dialog.
SMS imports the storm data, creating a new coverage called “
storm”, and loads the storm data into the coverage. The Graphics
Window should now include the storm path
(Figure 2).
Figure 2 Storm path imported from the ATCF file
3.2 Interactive Storm
The following is given as an example of how to define a storm
interactively. This section
may be completed if desired, but is not necessary to complete
this tutorial.
To create a new wind coverage, do the following:
1. Right-click on “ Map Data” in the Project Explorer and select
New Coverage to bring up the New Coverage dialog.
2. In the Coverage Type section, select Models | Wind |
Holland/PBL.
3. Enter any desired name as the Coverage Name, or accept the
default name of “ADCIRC Wind”.
4. Click OK to close the New Coverage dialog and bring up the
Storm Attributes dialog.
5. Model and wind attributes can be specified here, but for this
tutorial, accept the default settings by clicking OK to close the
Storm Attributes dialog.
2 See http://www.nhc.noaa.gov/data/
http://www.nhc.noaa.gov/data/
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A new “ ADCIRC Wind” coverage should appear in the Project
Explorer. Digitizing a storm path would normally be done at this
point. Each point needs attributes, specified as
described in the next section. Because this tutorial is using
the imported storm data, it is not necessary to do this at this
time.
6. Right-click on “ ADCIRC Wind” and select Delete.
7. Click Yes when asked to confirm deletion of the coverage.
3.3 Storm Parameters
If the storm definition came from an external source, whether it
represents an historic storm or a pure simulation, the external
source will usually include the storm parameters.
These consist of a starting time for the storm and parameter
values at each location along
the storm path. To view and edit the storm parameters:
1. Select “ storm” to make it active.
2. Using the Select Feature Point tool, double-click on any
feature node on the storm path to bring up the Storm Track Node
Attributes dialog.
This causes SMS to convert to feature nodes all vertices in the
storm path on the active coverage. The Storm Track Node Attributes
dialog should appear similar to Figure 3.
Figure 3 Storm Track Node Attributes dialog
3. Notice the following fields:
Max sust wind spd (knots): This is the principal reflection of
the storm strength.
Min sea level pressure (mb): This is another reflection of the
storm strength.
Radius of the last closed isobar (nm): This defines the size of
the storm's significant influence in nautical miles.
Radius of max winds (nm): This defines the size of the central
portion of the storm in nautical miles.
4. Note that the Storm start time is August 15, 2010 at
midnight. All simulations using this storm must start at or after
that date.
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5. Scroll to the far right to the last node in the storm
definition (Node 56).
6. Note that the Time offset (hours) for this point is 120 hrs.
This corresponds to August 19, 2010 at 6:00 pm. All simulations
using this storm definition must end before that date/time.
7. Click OK to close the Storm Track Node Attributes dialog.
3.4 Setting the ADCIRC Parameters for Wind
After specifying the storm track and defining the storm
parameters, the option to have
ADCIRC compute a symmetric cyclonic storm can be enabled by
doing the following:
1. Right-click on “ M2 Tide” and select Duplicate to create a
simulation that will include the storm.
2. Right-click on “ M2 Tide (2)” and select Rename. Change the
simulation name to “NWS8”.
3. Right-click on “ storm” and select Link > ADCIRC
Simulations -> NWS8 to associate this storm with the new
simulation.
4. Right-click on “ NWS8” and select Model Control... to bring
up the ADCIRC Model Control dialog.
5. On the General parameters tab, in the Simulation description
section, enter “Symmetric storm” as the Project title.
6. On the Wind tab, in the Option - NWS section, select NWS=8 –
Symetric cyclonic storm from path from the drop-down.
7. Uncheck the Use existing wind file toggle. With the “ storm”
linked to the simulation SMS will create the wind file.
8. On the Output tab, in the Meteorological subsection of the
Global output section, select “ASCII” from the Output format
drop-down.
9. Enter “1.0” as the Start (days), “5.0” as the End (days), and
“60.0” as the Increment (min). This specifies that output should
start at the end of the day 1
and continue through the entire simulation, and it instructs
ADCIRC to output wind and pressure information every hour
10. Click OK to exit the ADCIRC Model Control dialog.
4 Running ADCIRC with Wind
To run ADCIRC with wind:
1. Right-click on “ NWS8” and select Save, Export, and Launch
ADCIRC.
The model run will start automatically. On a typical PC running
the serial version of
ADCIRC this simulation will take around 30 minutes. The parallel
version could be used to speed up execution.
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2. When ADCIRC finishes, click Load Solution to import the
solution into SMS. (If you do not wish to wait for the model to run
to complete, the Abort button
can be used to terminate the simulation. In this case, open the
NWS8.h5 solution file.)
3. Click Close to exit the Simulation Run Queue dialog.
5 Visualization of the Computed Storm
The solution for this simulation includes meteorological data in
addition to the hydraulic
data from the base M2 Tide simulation. These data sets can be
investigated in the same fashion. For example:
1. Select the Wind Stress vector data set and the Minimum
Pressure scalar dataset. Depending on the active time step, the
display should appear similar to Figure 4.
Figure 4 Symmetric cyclone visualization
6 Conclusion
This concludes the “ADCIRC – Symmetric Cyclone Simulation”
tutorial. Feel free to
continue experimenting in SMS, or exit the program.